Something odd going on with my Dalmatian molly

[Sublimer]

She's usually the life of the party but...



I did a 25% water change 3 hours ago and removed the uneaten food from the sand. About an hour after she laid in this corner and has since stayed there, doing nothing. My neon tetras swam by at one point and nudged at her and she just took the hit so she's not responding to anything. She seems to be breathing fine but she's just sitting there.
Any idea what it might be? High ammonia levels? I have no way of checking the parameters at the moment and I'd like to know what should be done for now

 

[Mcor]

A further water change for now. You really need to get your water tested ASAP so you can find out if you're dealing with a water quality issue. Hope someone can help you!